Chen Qingqing, Li Daxin, Liao Xingqi, Yang Zhihua, Jia Dechang, Zhou Yu, Riedel Ralf
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150080, China.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilongjiang, Harbin 150001, China.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):34889-34898. doi: 10.1021/acsami.1c07912. Epub 2021 Jul 20.
Lightweight SiBCN ceramic nanofibers were prepared by a combination of electrostatic spinning and high-temperature annealing techniques, showing tunable electromagnetic wave absorption. By controlling the annealing temperature, the nanoscale architectures and atomic bonding structures of as-prepared nanofibers could be well regulated. The resulting SiBCN nanofibers ∼300 nm in diameter, which were composed of an amorphous matrix, β-SiC, and free carbon nanocrystals, were defect-free after annealing at 1600 °C. SiBCN nanofibers annealed at 1600 °C exhibited good microwave absorption, obtaining a minimum reflection coefficient of -56.9 dB at 10.56 GHz, a sample thickness of 2.6 mm with a maximum effective absorption bandwidth of 3.45 GHz, and a maximum dielectric constant of 0.44. Owing to the optimized A + B + C microstructure, SiBCN ceramic nanofibers with satisfying microwave absorption properties endowed the nanofibers with the potential to be used as lightweight, ultrastrong radar wave absorbers applied in military and the commercial market.
通过静电纺丝和高温退火技术相结合制备了轻质SiBCN陶瓷纳米纤维，其具有可调的电磁波吸收性能。通过控制退火温度，可以很好地调节所制备纳米纤维的纳米级结构和原子键合结构。所得到的直径约300 nm的SiBCN纳米纤维由非晶基体、β-SiC和游离碳纳米晶体组成，在1600℃退火后无缺陷。在1600℃退火的SiBCN纳米纤维表现出良好的微波吸收性能，在10.56 GHz时获得-56.9 dB的最小反射系数，样品厚度为2.6 mm，最大有效吸收带宽为3.45 GHz，最大介电常数为0.44。由于优化的A + B + C微观结构，具有令人满意的微波吸收性能的SiBCN陶瓷纳米纤维使纳米纤维有潜力用作应用于军事和商业市场的轻质、超强雷达波吸收体。
